A Geometric Approach to Modelling Friction In Metal Forming

Becker, P. C.; Jeon, Hiojung; Chang, Chao Cheng; Bramley, Alan N

doi:10.1016/s0007-8506(07)60567-8

Cited by 18 publications

(11 citation statements)

References 4 publications

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“…Shi et al (2002) analyzed roughness transfer from serrated tool surfaces by slip line field analysis. Becker et al (2003) identified the effect of the tool roughness to the Tresca friction factor in a ring test. They showed that longer pitch and smaller height of the tool roughness profile leads to smaller friction factor.…”

Section: Introductionmentioning

confidence: 99%

Influence of tool roughness and lubrication on contact conditions in skin-pass rolling

Kijima

Bay

2009

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Influence of tool roughness and lubrication on contact conditions in skin-pass rolling

Kijima

Bay

2009

Journal of Materials Processing Technology

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“…Since deep drawing is essentially affected by the friction between the work piece and tools [4,5], which is also affected by the size effects [6][7][8], the trilobogical size effects in sheet metal forming were investigated in our previous work [1][2][3]. The size dependent friction functions were acquired from scaled strip drawing test.…”

Section: Introductionmentioning

confidence: 99%

“…Strip drawing experiments with six different punch diameters (1,5,10,20, 50 and 100 mm) were carried out. All geometrical parameters of tools and work pieces are scaled by the same scaling factor and all process parameters are constant for all experiments according to the law of similarity.…”

Section: Introductionmentioning

confidence: 99%

Determination of size-dependent friction functions in sheet metal forming with respect to the distribution of the contact pressure

Vollertsen

2008

Prod. Eng. Res. Devel.

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The aim of this paper is to optimize the analytical model developed in previous work (Hu et al. in Determination of the friction coefficient in deep drawing, process scaling. In: Vollertsen F, Hollmann F (eds) Proceeding of the 1st colloquium of DFG priority program process scaling. BIAS-Verlag, ISBN 3-933762-14-6, Bremen, pp 27-34, 2003; Hu and Vollertsen in J Technol Plast 29:1-9, 2004; Vollertsen and Hu in Annu CIRP 55(1): [291][292][293][294] 2006) with respect to the distribution of the contact pressure at the drawing radius. A size-dependent friction function was acquired based on the experimentally measured punch force from strip drawing with deflection, which can identify the tribological size effects in sheet metal forming. This function was implemented in the FEM-simulation. The distribution of the contact pressure at the drawing radius was assumed to be uniform in the previous analytical model, which is not right, since the simulated punch force versus punch travel curve showed a difference of about 11% from the experimental curve (Vollertsen and Hu in Annu CIRP 55(1): [291][292][293][294] 2006). In the new analytical model the non-uniform distribution of contact pressure between the work piece and the tools was taken into account. The simulated curve using the friction function from the new model shows a better agreement with the experimental curve.

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“…the occurrence of unexpected results concerning the forming force of the forming limit [1]. Since deep drawing is essentially affected by the friction between the work piece and tools [2,3], which is also affected by the size effects [4,5], the tribological size effects in sheet metal forming were investigated in our former work [6,7] and the sizedependent friction functions were acquired. The aim of this work is to realize size dependent FEMsimulation for deep drawing applying the acquired friction functions.…”

Section: Introductionmentioning

confidence: 99%

Modelling of friction with respect to size effects

Vollertsen

2008

Int J Mater Form

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In this paper a size dependent FEM-simulation for sheet metal forming was realized applying the size dependent friction functions acquired from strip drawing tests [1]. The software ABAQUS 6.6.3 was used to simulate the strip drawing tests and deep drawing process in different process dimensions. A 2-dimensional model was built for strip drawing test and a 3-dimensional model was built for deep drawing process. Both processes were experimentally carried out in different dimensions. A constant friction coefficient as well as a friction function, which shows a dependence of friction coefficient on the contact pressure, was applied in the simulation. The simulated punch force vs. punch travel curves were then compared with the experimental curves. A discussion about the difference between these curves with consideration of tribological size effects will be given.

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A Geometric Approach to Modelling Friction In Metal Forming

Cited by 18 publications

References 4 publications

Influence of tool roughness and lubrication on contact conditions in skin-pass rolling

Influence of tool roughness and lubrication on contact conditions in skin-pass rolling

Determination of size-dependent friction functions in sheet metal forming with respect to the distribution of the contact pressure

Modelling of friction with respect to size effects

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